1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *
4 * Copyright (c) 2004 MIPS Inc
5 * Author: chris@mips.com
6 *
7 * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
8 */
9 #include <linux/interrupt.h>
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/kernel_stat.h>
13 #include <asm/io.h>
14 #include <asm/irq.h>
15 #include <asm/msc01_ic.h>
16 #include <asm/traps.h>
17
18 static unsigned long _icctrl_msc;
19 #define MSC01_IC_REG_BASE _icctrl_msc
20
21 #define MSCIC_WRITE(reg, data) do { *(volatile u32 *)(reg) = data; } while (0)
22 #define MSCIC_READ(reg, data) do { data = *(volatile u32 *)(reg); } while (0)
23
24 static unsigned int irq_base;
25
26 /* mask off an interrupt */
27 static inline void mask_msc_irq(struct irq_data *d)
28 {
29 unsigned int irq = d->irq;
30
31 if (irq < (irq_base + 32))
32 MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
33 else
34 MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
35 }
36
37 /* unmask an interrupt */
38 static inline void unmask_msc_irq(struct irq_data *d)
39 {
40 unsigned int irq = d->irq;
41
42 if (irq < (irq_base + 32))
43 MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
44 else
45 MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
46 }
47
48 /*
49 * Masks and ACKs an IRQ
50 */
51 static void level_mask_and_ack_msc_irq(struct irq_data *d)
52 {
53 mask_msc_irq(d);
54 if (!cpu_has_veic)
55 MSCIC_WRITE(MSC01_IC_EOI, 0);
56 }
57
58 /*
59 * Masks and ACKs an IRQ
60 */
61 static void edge_mask_and_ack_msc_irq(struct irq_data *d)
62 {
63 unsigned int irq = d->irq;
64
65 mask_msc_irq(d);
66 if (!cpu_has_veic)
67 MSCIC_WRITE(MSC01_IC_EOI, 0);
68 else {
69 u32 r;
70 MSCIC_READ(MSC01_IC_SUP+irq*8, r);
71 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
72 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
73 }
74 }
75
76 /*
77 * Interrupt handler for interrupts coming from SOC-it.
78 */
79 void ll_msc_irq(void)
80 {
81 unsigned int irq;
82
83 /* read the interrupt vector register */
84 MSCIC_READ(MSC01_IC_VEC, irq);
85 if (irq < 64)
86 do_IRQ(irq + irq_base);
87 else {
88 /* Ignore spurious interrupt */
89 }
90 }
91
92 static void msc_bind_eic_interrupt(int irq, int set)
93 {
94 MSCIC_WRITE(MSC01_IC_RAMW,
95 (irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
96 }
97
98 static struct irq_chip msc_levelirq_type = {
99 .name = "SOC-it-Level",
100 .irq_ack = level_mask_and_ack_msc_irq,
101 .irq_mask = mask_msc_irq,
102 .irq_mask_ack = level_mask_and_ack_msc_irq,
103 .irq_unmask = unmask_msc_irq,
104 .irq_eoi = unmask_msc_irq,
105 };
106
107 static struct irq_chip msc_edgeirq_type = {
108 .name = "SOC-it-Edge",
109 .irq_ack = edge_mask_and_ack_msc_irq,
110 .irq_mask = mask_msc_irq,
111 .irq_mask_ack = edge_mask_and_ack_msc_irq,
112 .irq_unmask = unmask_msc_irq,
113 .irq_eoi = unmask_msc_irq,
114 };
115
116
117 void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
118 {
119 _icctrl_msc = (unsigned long) ioremap(icubase, 0x40000);
120
121 /* Reset interrupt controller - initialises all registers to 0 */
122 MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
123
124 board_bind_eic_interrupt = &msc_bind_eic_interrupt;
125
126 for (; nirq > 0; nirq--, imp++) {
127 int n = imp->im_irq;
128
129 switch (imp->im_type) {
130 case MSC01_IRQ_EDGE:
131 irq_set_chip_and_handler_name(irqbase + n,
132 &msc_edgeirq_type,
133 handle_edge_irq,
134 "edge");
135 if (cpu_has_veic)
136 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
137 else
138 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
139 break;
140 case MSC01_IRQ_LEVEL:
141 irq_set_chip_and_handler_name(irqbase + n,
142 &msc_levelirq_type,
143 handle_level_irq,
144 "level");
145 if (cpu_has_veic)
146 MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
147 else
148 MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
149 }
150 }
151
152 irq_base = irqbase;
153
154 MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT); /* Enable interrupt generation */
155
156 }
157
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